Protecting mechanism for pressing, punching, and cutting machines, &amp;c.



l G. KRAMER. y PROTECTING MEGHANISM FOR PRESSING, PUNGHING, AND SUTTING MAGEINES,&0'.

n LPLIOLTXQN ILBD JAN; 3, 19310. 969,961.

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alle wbcm it m'ayv concern:

IIT.h .RWAYL vBe 't' known that I, GUSTAV KRAMER, a

t. of the Kin of Norway, residing at Sandvilteu, near C rlstlama, Norway, have certain new and useful Improvementsinjlrotcctmg Mechanisms for Pressi'no; Punching, Cuttin lliachines, or the Lilte; and I do hereby t eclare the following to be a full, clear, and exact description of the invention, such will enable others skilled 'in the art. to which it appertains to make and-'hse the same, reference being had to the accompanying. drawings, and to letters or ligures of ref ,ere'nce marked thereon,

' which form a. part of this specification.

The prcse'ntfinvention has for itsobject to provide'a safet device in which the protecting member iv ich may be of any suitable construction is actuated by a lever combined witlifthe starting inechanlsmin s uch a. man ,ner that the s tartingmechamsm 1s not actuated beftiresaidlever has been caused to move a certa-in, distance.

The apparatus forming the subject. matter ofl the present invention i's broadlyT charac- 'terizedby the fact that' the protecting device acts` as a kind of forerunner of the op tingmember by moving in the same dir" as. the latter 1n such a manner thatfor'ms ce-'1tmay clamp the hand or fingers of"'tl'1e.j,\vorkman or any foreign body inadvertently placed between the operating parts and cause said protecting device to be stopped in its motion which will moreover prevent the actuation of the mechanism of the machine or tool. Owing to this mode of operation of the protecting member the same may have a very simple form and small size and it should as much as possible inclose the operating member so that wherever the workman might. hold his fingers Within the reach of the operating parts itwill prevent the protecting` member from moving into its final position; further it should be sufficiently rigid so as not. to bend under the preure to which itis subjected by the pressure on the starting apparatus. The arran ement is so made that the forerunner moves in the same direction as the operating part.

In the annexed drawing the device is shown as a plied to a punching machine to be started y treading on a foot-board but it will be understood that it may also be Specicatlon ot Letters Patent.

' Application le January 3, 1910. Serial No. 536,081.

srarnsrarnnr OFFICE.

'SANDVIKEN. NEAR. CI'IBISTIANIA. NORWAY. ASSIGNOR TO AK- :SANDVIKENS BLIKVABEFABRIK, F SANDVIKEN, NEAR CHRIS- FOR PRESSING, PUNCHING, AND CUTTING MACHINES, &c.

Patented Sept. 13, 1910.

used in machines which are started b v lmud or otherwise while itV may easilfiT be applied to new as well as to old nmchines of any construction.

The releasing mechanism 'for the operating.member comprises a lever 1 fulcrumcd on t-he machine frame at 2 and connected by means of a rod 3 with the starting mem bers. The operating member here shown consists of a reciprocable punch l coperating with a matrix, as The protecting member consists of an oscillating arm (l pivoted at 7. and has preferably formed on its front end a rimT S which surrounds the punch 4. The mec ianism for operating the protecting member comprises a bell-crank lever 10, 11, pivotally mounted in a bracket 12 formed on a bar 9 mounted on the ma chine frame above the lever 1. The arm of the bell-crank lever lies over the front end of the lever l and protects the latter from engagement by the foot of the operator. Said arm 10 is held normallyT elevated above the lever 1 by means of a spring T3 which is connected to the rod 9 and to the arm 1l, and the latter is pivotally connected to one end of an actuating member or rod 14, the free end of the latter being provided with a cam-sha )ed head 15. This head rests in a guidelock 1T fixed on the rear end of rod 9 and sup )Orts the lower beveled end 1G of a. r 18, the upper end of which is adjustablyl and pvotally connected to the rear end of the arm (l. The lower end of the rod 18 is guided in the block 17 by means of pins 19 on said end project-ing into slots Q0 in the head 1T. -l regulating screw, as 21, is provided, b v means of which the position of the arm l' may be adjusted vertically.

The mode of operation of the apparatus will be clearly understood from the above description. If the parrain operating steps on the arm l() of the bell crank-lever the rod 1l will be pulled forward and b v the action of the head on the inclined end surface 16 of the rod 18 the latter will be. raised so that the arm G will -be rocked on its pivot itsl ring shaped fore-end moving downward. If during this movement the latter meets with some obstructitm such :is a pcrsolfsI hand the arm l0 will not. reach the lever l and thus the starting device will not. be actuated. If no obstruction is met with the must, be so adjusted that the lower ed e of ing the-'protecting member occupies a ower ositlon than the lower edge of the punch.

or this purpose the adjustment is eifected in the construction illustrated in the drawby the screw *21 which will then during the" iperntion of the machine afford the nece:.,. v resistance for the removal of .fthe material.

According to my improved kind of ina.- chine :i more or less perfect annular shape muy lie given to the forerunner and it 'may also be nnnle higher so as to better cover the space of operation. Generally a form like the one illustrated will :dford sufficient protection. -While full}r protecting the workman itdoes notin any way impede the work; if for instance a greater number of articles are to be punched out of a sheet-iron plate without stopping the machine the feeding of the sheet iron between each stroke of the punch may be eilected without being impeded by the protectlng member which in this case only rests on the sheet iron.

Claims:

1. The combination with a reciprocable operating member, of an oscillatory protect.- ing member, mechanism for operating the protect-ing member, and mechanism operated by said operating mechanism to release the operating member.

2. The combination with a reciprocable operatin member, of an oscillatory protecting mem r surrounding the latter, mechanism for operating the Jrotecting member` and mechanism operated by said operating mechanism to release the operating member.

The combination with a reciprocable operating member, of a pivoted cprotecting member, a pivoted lever connecte with the operating member, a pivoted arm mounted above. said lever and movable into engagement therewith, und menus to operatively connect the nrln with the promoting nieniber.

4. The coi'nliiinntion with n reciproenble punching member, of a pivoled nrin having its free end nenr Suid member, n fooi; lgvpy for releasing the punching member. :i bellcrunk lever movable into engagement with the foot lever, n rod connected to the bellcranlc lever, and a slide operable bv the rod and connected to the pivoted arm.

The combination with a rec-.iprocahle operating nxelnlier, of releasing mechanism therefor embodying a. foot lever, n pivotcd protecting member for the opcrntinof member, n slide adjustahl)v connected with the protecting member. :i bell-crank lever movable into engagement with the foot-lewin'. :in-l a rod connected to the liclbcranlc leve.' adapted to netnate the slide.

G. The combination with n reeiprocable punching or pressing member. of :i releasing mechanism thcrcfm embodying n. foot lever, an oscillatory protecting member for the pressing member, a guide-block, a slide therein adjustably connected with the protecting member` a bell-crank lever movable int-o engagement with the foot lever, and :t rod pivotally connected with the bell-crank lever and having an inclined head supporting the slide.

7. In a. machine for pressing, punching cutting or the like the combination with pressing, punching or cutting members of a protecting member, a foot. actuated lever for starting the machine, a. foot. actuated bell crank lever mounted above the start-ing lever and being connected with a rod acting on another rod connected. with the above named protecting member.

In testimongY that l claim the foregoing as my invention. I'have signed my name in presence of two subscribing witnesses.

MARTIN EcxiHorr, O'r'ro J. G-LLANs. 

